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50 lines
1.8 KiB
C
50 lines
1.8 KiB
C
/* Change priority ceiling setting in pthread_mutexattr_t.
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Copyright (C) 2006-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Jakub Jelinek <jakub@redhat.com>, 2006.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <pthreadP.h>
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#include <atomic.h>
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int
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pthread_mutexattr_setprioceiling (pthread_mutexattr_t *attr, int prioceiling)
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{
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/* See __init_sched_fifo_prio. */
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if (atomic_load_relaxed (&__sched_fifo_min_prio) == -1
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|| atomic_load_relaxed (&__sched_fifo_max_prio) == -1)
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__init_sched_fifo_prio ();
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if (__glibc_unlikely (prioceiling
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< atomic_load_relaxed (&__sched_fifo_min_prio))
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|| __glibc_unlikely (prioceiling
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> atomic_load_relaxed (&__sched_fifo_max_prio))
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|| __glibc_unlikely ((prioceiling
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& (PTHREAD_MUTEXATTR_PRIO_CEILING_MASK
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>> PTHREAD_MUTEXATTR_PRIO_CEILING_SHIFT))
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!= prioceiling))
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return EINVAL;
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struct pthread_mutexattr *iattr = (struct pthread_mutexattr *) attr;
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iattr->mutexkind = ((iattr->mutexkind & ~PTHREAD_MUTEXATTR_PRIO_CEILING_MASK)
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| (prioceiling << PTHREAD_MUTEXATTR_PRIO_CEILING_SHIFT));
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return 0;
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}
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